How to set time limit for each weekday?

Hi,

 

I like this application.

 

During the trial, I found that there are only 2 type of day, weekend or weekday. Happen Friday is falling into Weekday but my kids consider the Friday is weekend and want more time.

 

Is there any way that I could set time limit for each day instead of  just weekend or weekday ?

 

Thanks for any advice.

 

Eugene